button {
    margin: 0 20px 0 0;
    width: 83px;
}

button#hangupButton {
    margin: 0;
}

video {
    height: 225px;
    margin: 0 0 20px 0;
    vertical-align: top;
    width: calc(50% - 12px);
}

video#localVideo {
    margin: 0 20px 20px 0;
}

@media screen and (max-width: 400px) {
    button {
        width: 83px;
    }

    button {
        margin: 0 11px 10px 0;
    }

    video {
        height: 90px;
        margin: 0 0 10px 0;
        width: calc(50% - 7px);
    }

    video#localVideo {
        margin: 0 10px 20px 0;
    }

}
